What are pesticides and herbicides? Explain giving examples.

3

(a)

How is the temperature effected as we go up the earth's surface? Explain

3

(a)

What do you mean by ozone hole? What are its consequences?

3

(a)

Sonu and Nilesh were friends. In winters, one day when they were going to school at 10:00 am Sonu felt irritation in his eyes and throat. He was also unable to breath.
Nilesh immediately took him to a doctor. Doctor gave him the proper remdy. When he became well, Nilesh asked reason for this Doctor answered him satisfactorily.
(i) Can you guess what reason was given by the doctor for the illness of Sonu.
(ii) Why such kind of polluting atmospheric change occurs?
(iii) What should be done to prevent the formation of smog?
(iv) What values are possessed by Nilesh?

3

(a)

Explain the tropospheric pollution in 100 words?

3

(a)

Carbon monoxide gas is more dangerous than carbon dioxide gas. why?

3

(a)

What is smog? How is classical smog different from photochemical smog?

3

(a)

Write down the reactions involved during the formation of photochemical smog.

3

(a)

What are the reactions involved for ozone layer depletion in the stratosphere?

3

(a)

What are the major causes of water pollution? Explain.

3

(a)

What do you mean by green chemistry? How will it help in decreasing environmental pollution?

3

(a)

How carbon monoxide acts as a poison for human beings?

3

(a)

What is photochemical smog? What are its effects? How can it be controlled?

3

(a)

What do you mean by greenhouse effect? What is the role of CO₂ in the greenhouse effect?

3

(a)

(a) Define eutrophication and pneumoconiosis.
(b) Write difference between photochemical and classical smog.

3

(a)